CN114363127B - Signal equalization method and device, electronic equipment and storage medium - Google Patents
Signal equalization method and device, electronic equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a signal equalization method, a signal equalization device, electronic equipment and a storage medium. The method comprises the following steps: acquiring a current modulation value, a signal and a phase difference of the signal, and determining a corrected modulation value set according to the current modulation value; correcting the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal; and determining the inter-symbol interference coefficient of the signal and the symbol statistic of the signal by utilizing the differential phase waveform of the signal and the phase difference of the signal, and carrying out symbol equalization on the signal according to the inter-symbol interference coefficient and the symbol statistic to obtain the target modulation value of the signal. In other words, in the embodiment of the invention, the waveform of the differential phase waveform of the current modulation value is corrected by utilizing the existing modulation value set, and the waveform of the signal can be iteratively corrected before the signal is equalized, so that the waveform of the signal can be accurately estimated; and the existing modulation value is used for triggering correction, so that the complexity of signal equalization is reduced.
Description
Technical Field
The embodiment of the invention relates to a communication technology, in particular to a signal equalization method, a signal equalization device, electronic equipment and a storage medium.
Background
The continuous phase modulation (Continuous Phase Modulation, CPM) in the technical field of communication has the characteristics of constant envelope, fast power spectrum sidelobe attenuation, flexible and various modulation formats and the like, and can control indexes such as transmission rate, power spectrum shape, bandwidth and the like of CPM signals by using different combinations of modulation parameters such as modulation indexes, modulation orders, frequency pulse types and the like. Not only does the non-ideal nature of the transmitter analog device cause the actually transmitted CPM signal to be distorted, but the non-ideal nature of the signal transmission channel has multipath fading, such that the transmitted CPM signal again scales or distorts. In the prior art, a least mean square algorithm (Least Mean Squares, LMS) and a recursive least square method (Recursive Least Squares, RLS) are adaptive algorithms for estimating a signal waveform, but accurately estimate the signal waveform, require more training data to accurately estimate the signal waveform, and are not suitable for a CPM low-power consumption receiver.
Disclosure of Invention
The invention provides a signal equalization method, a signal equalization device, electronic equipment and a storage medium, which are used for realizing self-adaptive correction of differential waveform pulses by using equalization output modulation symbols by taking differential phases as observables.
In a first aspect, an embodiment of the present invention provides a signal equalization method, applied to a receiver, where the method includes:
acquiring a current modulation value, a signal and a phase difference of the signal, and determining a corrected modulation value set according to the current modulation value;
correcting the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal;
and determining an intersymbol interference coefficient of the signal and a symbol statistic of the signal by utilizing the differential phase waveform of the signal and the phase difference of the signal, and carrying out symbol equalization on the signal according to the intersymbol interference coefficient and the symbol statistic to obtain a target modulation value of the signal.
Further, correcting the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal, including:
calculating an ideal differential phase waveform of the signal according to an ideal phase response function and a delay time of the signal;
and correcting the differential phase waveform corresponding to the current modulation value according to the ideal differential phase waveform, the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal.
Further, correcting the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal, including:
calculating an ideal phase difference sample of the signal from the ideal differential phase waveform and the set of modified modulation values;
calculating a secondary phase difference of the signal according to the ideal phase difference sampling and the phase difference of the signal;
and correcting the differential phase waveform corresponding to the current modulation value according to the secondary phase difference to obtain the differential phase waveform of the signal.
Further, calculating a secondary phase difference of the signal from the ideal phase difference sample and the phase difference of the signal, comprising:
determining a column vector of the ideal phase difference sample and a column vector corresponding to a phase difference of the signal;
and taking the difference value of the column vector corresponding to the phase difference of the signal and the column vector sampled by the ideal phase difference as the secondary phase difference of the signal.
Further, correcting the differential phase waveform corresponding to the current modulation value according to the secondary phase difference to obtain a differential phase waveform of the signal, including:
Determining the difference value of ideal sampling coefficients of the signals according to the secondary phase difference, and determining the sampling coefficient corresponding to the current modulation value according to the differential phase waveform corresponding to the current modulation value;
determining the sampling coefficient of the signal according to the difference value of the ideal sampling coefficient of the signal and the sampling coefficient corresponding to the current modulation value;
and performing interpolation operation on the sampling coefficient of the signal to obtain a differential phase waveform of the signal.
Further, determining a modified modulation value set from the current modulation value includes:
and adding the current modulation value to a modulation value set corresponding to the current modulation value to obtain the corrected modulation value set.
Further, determining an inter-symbol interference coefficient of the signal and a symbol statistic of the signal using the differential phase waveform of the signal and the phase difference of the signal, comprising:
determining an intersymbol interference coefficient of the signal by utilizing a differential phase waveform of the signal;
and performing symbol sampling on the signal by utilizing the phase difference of the signal to obtain symbol statistics of the signal.
In a second aspect, an embodiment of the present invention further provides a signal equalization apparatus, where the apparatus includes:
The set determining module is used for acquiring a current modulation value, a signal and a phase difference of the signal, and determining a corrected modulation value set according to the current modulation value;
the waveform correction module is used for correcting the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal;
and the symbol equalization module is used for determining an intersymbol interference coefficient of the signal and a symbol statistic of the signal by utilizing the differential phase waveform of the signal and the phase difference of the signal, and carrying out symbol equalization on the signal according to the intersymbol interference coefficient and the symbol statistic to obtain a target modulation value of the signal.
In a third aspect, an embodiment of the present invention further provides an electronic device, including:
one or more processors;
storage means for storing one or more programs,
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement a signal equalization method as described in any of the embodiments of the present invention.
In a fourth aspect, embodiments of the present invention further provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a signal equalization method according to any of the embodiments of the present invention.
According to the embodiment of the invention, the corrected modulation value set is determined by acquiring the current modulation value, the signal and the phase difference of the signal; correcting the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal; and determining the inter-symbol interference coefficient of the signal and the symbol statistic of the signal by utilizing the differential phase waveform of the signal and the phase difference of the signal, and carrying out symbol equalization on the signal by using the inter-symbol interference coefficient and the symbol statistic to obtain the target modulation value of the signal. In other words, in the embodiment of the invention, the differential phase waveform of the current modulation value is subjected to waveform correction by utilizing the existing modulation value set to obtain the differential phase waveform of the signal, so that the adaptive correction of the signal waveform can be performed before the signal is equalized, the waveform of the signal is accurately estimated, the signal waveform is subjected to iterative correction by triggering through a new modulation value, and the complexity of signal equalization is reduced under the condition that training data is not used.
Drawings
Fig. 1 is a schematic flow chart of a signal equalization method according to an embodiment of the present invention;
fig. 2 is another flow chart of a signal equalization method according to an embodiment of the present invention;
Fig. 2A is a schematic diagram of a signal equalization method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a signal equalization device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a schematic flow chart of a signal equalization method according to an embodiment of the present invention, where the method may be performed by a signal equalization apparatus according to an embodiment of the present invention, and the apparatus may be implemented in software and/or hardware. In a specific embodiment, the apparatus may be integrated in an electronic device, which may be a server, for example. The following embodiments will be described taking the example of the integration of the apparatus in an electronic device, and referring to fig. 1, the method may specifically include the following steps:
s110, acquiring a current modulation value, a signal and a phase difference of the signal, and determining a corrected modulation value set according to the current modulation value;
For example, the current modulation value may be understood as a modulation value currently output by the balanced output interface, that is, an output value corresponding to the previous balancing, which is also a latest modulation value of the balanced output interface, and the waveform is adaptively adjusted by means of an output value corresponding to the previous balancing before the current balancing. The signal may be from a signal receiving apparatus, which may be an apparatus having a signal receiving function such as a receiver or a terminal, and the signal may be a CPM signal transmitted from a base station to the receiver. The CPM signal is a continuous signal modulated by a generalized modulation scheme (i.e., a continuous phase modulation scheme) of phase modulation information. The phase difference of the signals can be understood as the phase difference of the first signal after being delayed by a delay time, i.e. the difference between the phase of the signal and the delay phase of the first signal. And correcting the differential phase waveform of the signal by using the correction modulation set, and accurately estimating the waveform of the signal on the premise of not using a large number of training samples, so that the recurrence of equalization is reduced.
In a specific implementation, the modulation value and the signal currently output by the equalization output interface can be obtained, and the delay time of the signal can be calculated according to the modulation format of the signal. The modulation format of the signal comprises a medium frequency pulse function g (n), a modulation order M and a modulation index h. Determining the phase difference delta theta of the delayed signal according to the delay time of the signal Δn (n). Updating the modulation set corresponding to the current modulation value according to the current modulation value to obtain a repairPositive modulation set. The correction modulation set is used for correcting the differential phase waveform of the signal.
S120, correcting the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal;
for example, the differential phase waveform corresponding to the current modulation value may be understood as a differential phase waveform of the signal before equalization of the current modulation value determined by using the ideal phase pulse. The differential phase waveform is to determine the function value corresponding to the continuous time and the function difference corresponding to the delay according to the ideal phase pulse function, the delay time of the signal and the continuous time of the signal. The differential phase waveform of the signal can be understood as the differential phase waveform of the signal before the current modulation value is equalized, which is determined by the ideal phase pulse.
In the specific implementation, an ideal phase difference sample corresponding to the signal is determined according to the phase difference of the signal and the correction modulation set, a phase difference column vector of the signal is determined according to the value at the distance position of each symbol corresponding to the phase difference of the signal, and an ideal phase sampling column vector corresponding to the signal is determined according to each modulation value in the correction modulation set. And correcting the differential phase waveform corresponding to the current modulation according to the phase difference column vector of the signal and the ideal phase sampling column vector corresponding to the signal to obtain the differential phase waveform of the signal.
S130, determining an inter-symbol interference coefficient of the signal and a symbol statistic of the signal by utilizing a differential phase waveform of the signal and a phase difference of the signal, and carrying out symbol equalization on the signal according to the inter-symbol interference coefficient and the symbol statistic to obtain a target modulation value of the signal.
The symbol statistics corresponding to the signal may illustratively be understood as statistics obtained by sampling the phase difference at the first peak position sampling point according to the sampling type and according to the symbol period, for determining the difference between the symbols. The intersymbol interference coefficient of a signal can be understood as the coefficient of the superposition of a pulse amplitude modulated signal with intersymbol interference of the base pulse for eliminating the intersymbol interference. The target modulation value of the signal may be understood as a demodulation value outputted after demodulating the signal according to a symbol sampling and equalization manner.
In the specific implementation, the differential phase waveform corresponding to the current modulation is corrected according to the phase difference column vector of the signal and the ideal phase sampling column vector corresponding to the signal, so as to obtain the differential phase waveform of the signal. And determining the inter-symbol interference coefficient of the signal and the symbol statistic of the signal by utilizing the differential phase waveform of the signal and the phase difference of the signal, and carrying out symbol equalization on the signal according to the inter-symbol interference coefficient and the symbol statistic to obtain the target modulation value of the signal. The phase difference is based on the superposition of the pulse amplitude modulation signals with intersymbol interference of ideal pulses, and the demodulation of the signals can be regarded as the demodulation of band-limited channel signals with intersymbol interference, namely, the demodulation of the signals is achieved by utilizing the equalization type to perform equalization on the basis of eliminating the intersymbol interference.
According to the embodiment of the invention, the corrected modulation value set is determined by acquiring the current modulation value, the signal and the phase difference of the signal; correcting the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal; and determining the inter-symbol interference coefficient of the signal and the symbol statistic of the signal by using the differential phase waveform of the signal and the phase difference of the signal, and performing symbol equalization on the inter-symbol interference coefficient and the symbol statistic to obtain the target modulation value of the signal. In other words, in the embodiment of the invention, the differential phase waveform of the current modulation value is subjected to waveform correction by utilizing the existing modulation value set to obtain the differential phase waveform of the signal, so that the adaptive correction of the signal waveform can be performed before the signal is equalized, the waveform of the signal is accurately estimated, the signal waveform is subjected to iterative correction by triggering through a new modulation value, and the complexity of signal equalization is reduced under the condition that training data is not used.
The signal equalization method provided by the embodiment of the present invention is further described below, as shown in fig. 2, and the method specifically includes the following steps:
s210, acquiring a current modulation value, a signal and a phase difference of the signal, and adding the current modulation value into a modulation value set corresponding to the current modulation value to obtain a corrected modulation value set;
In a specific implementation, the modulation set corresponding to the current modulation value may be understood as a modulation set for correcting the differential phase waveform of the signal corresponding to the current modulation value before the current modulation value is equalized. And acquiring a modulation value and a signal which are currently output by the equalization output interface, and calculating the delay time of the signal according to the modulation format of the signal. Determining the phase difference delta theta of the delayed signal according to the delay time of the signal Δn (n). When the equalization output interface outputs one modulation value as the current modulation value, updating the modulation set before equalization, and adding the current modulation value into the modulation set corresponding to the current modulation value to obtain a corrected modulation value set of the signal.
Alternatively, the modulation set corresponding to the current modulation value may have modified data accumulation, and the modification may be started only when the modulation value set corresponding to the current modulation value is greater than the threshold data amount of the modulation value, for example: when the number of the modulation values in the modulation value set corresponding to the current modulation is 4, only the modulation set corresponding to the current modulation value is updated to obtain a corrected modulation value set, but no correction action is performed.
Optionally, when the receiver receives 10 signals this time, and uses each signal as an equalization unit, a correction modulation threshold is preset to be 10, the current modulation value is added to a modulation set corresponding to the current modulation value, and the number of modulation values in the correction modulation value set of the obtained signal is 10, and since the signals received this time are all equalized, correction is stopped, and since the interference signal may be received later.
S220, calculating an ideal differential phase waveform of the signal according to the ideal phase response function and the delay time of the signal;
in a specific implementation, the ideal phase response function may be understood as an ideal phase response pulse function q (n), n=1, 2, …, l×s, where n is a duration and l×s is the number of sampling points per symbol. An ideal differential phase waveform of the signal is calculated from the ideal response function and the delay time deltan of the signal. Namely, p is used Δn (n) =q (n) -q (n-deltan), 0.ltoreq.n.ltoreq.L.s+deltan, calculating the ideal difference of the signalsSplit phase waveform
Phase difference value delta phi Δn (n; alpha) is the base pulse p Δn Superposition of the pulse amplitude modulated signals with intersymbol interference of (n). Demodulation of the continuous signal may be converted to demodulation of a conventional band-limited channel signal with intersymbol interference. The demodulation method of the band-limited channel signal with intersymbol interference can be threshold hard judgment equalization, linear equalization, decision feedback equalization, viterbi equalization and the like.
S230, correcting the differential phase waveform corresponding to the current modulation value according to the ideal differential phase waveform, the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal.
In the specific implementation, an ideal phase difference sample corresponding to the signal is determined according to the phase difference of the signal and the correction modulation set, a phase difference column vector of the signal is determined according to the value at the distance position of each symbol corresponding to the phase difference of the signal, and an ideal phase sampling column vector corresponding to the signal is determined according to each modulation value in the correction modulation set. And correcting the differential phase waveform corresponding to the current modulation according to the phase difference column vector of the signal and the ideal phase sampling column vector corresponding to the signal to obtain the differential phase waveform of the signal.
Further, the differential phase waveform corresponding to the current modulation value is corrected according to the phase difference and the corrected modulation value set of the signal, so as to obtain the differential phase waveform of the signal, which comprises the following steps:
calculating ideal phase difference samples of the signals according to the ideal differential phase waveforms and the corrected modulation value sets;
calculating the secondary phase difference of the signal according to the ideal phase difference sampling and the phase difference of the signal;
and correcting the differential phase waveform corresponding to the current modulation value according to the secondary phase difference to obtain the differential phase waveform of the signal.
By way of example, ideal phase difference sampling of a signal can be understood as being based on an ideal differential phase waveform of the signal
The coefficients are calculated by sampling points at intervals S around the peak position, and can be
Wherein->
Calculated, for example: when->
n=1, 2, …,5 and s=2,/v>
Wherein the ideal differential phase waveform of the signal +.>
Peak position d on ∈>
Calculated, wherein->
Is rounded down. The secondary phase difference of a signal can be understood as a difference value determined according to a phase difference column vector of the signal and an ideal phase sampling column vector corresponding to the signal, and is used for determining a difference value of ideal sampling coefficients of the signal.
In the specific implementation, an ideal phase difference sample corresponding to the signal is determined according to the phase difference of the signal and the correction modulation set, a phase difference column vector of the signal is determined according to the value at the distance position of each symbol corresponding to the phase difference of the signal, and an ideal phase sampling column vector corresponding to the signal is determined according to each modulation value in the correction modulation set. Based on the phase difference column vector of the signal and the ideal phase sample corresponding to the signal The column vector determines a secondary phase difference, determines the difference value of ideal sampling coefficients of the signals according to the secondary phase difference, corrects the sampling coefficients according to the difference value of the ideal sampling coefficients of the signals, and obtains a differential phase waveform of the corrected signals according to the corrected sampling coefficients to obtain the differential phase waveform of the signals. Wherein, the differential phase waveform of the preset signal
n=1, 2, …, l×s+Δn, the sampling coefficient corresponding to n ∈n->
Sampling coefficient P of signal r The initial value of which is equal to the ideal sampling coefficient P ideal . By constantly and iteratively estimating the sampling coefficient P of the signal r And ideal sampling coefficient P ideal Delta=p of r -P ideal To achieve correction of the differential phase waveform of the signal.
Further, calculating a secondary phase difference of the signal from the ideal phase difference sample and the phase difference of the signal, comprising:
determining a column vector of ideal phase difference samples and a column vector corresponding to the phase difference of the signal;
the difference between the column vector corresponding to the phase difference of the signal and the column vector sampled by the ideal phase difference is taken as the secondary phase difference of the signal.
In the specific implementation, the modulation value output after the equalization output section is used as the current modulation value, and the current modulation value is added into a modulation value set corresponding to the current modulation value to obtain a corrected modulation value set 
According to the modified modulation value set->
Ideal phase of signalSampling, i.e. using
l＝0,1,…,2K，/>
Ideal phase difference sampling of the resulting signal
Is expressed as +.>
Wherein alpha is i+j-1 The matrix is expressed as a (l, m) =2pi h alpha i+m-k-l L=0, 1, …,2K, m=0, 1, …,2K. By delta theta Δn (l)＝ΔΘ Δn (i s+d-l S; α), l=0, 1, …,2K, calculating the value ΔΘ of the phase difference of the signal at the d position of each symbol Δn (l) And is expressed as DeltaΘ Δn (l) Is expressed as delta theta Δn . Sampling the corresponding column vector according to the ideal phase difference of the signal>
Column vector ΔΘ corresponding to phase difference of signal Δn And calculating the secondary phase difference delta of the signals by taking the difference.
Further, the differential phase waveform corresponding to the current modulation value is corrected according to the secondary phase difference, so as to obtain a differential phase waveform of the signal, which comprises the following steps:
determining the difference value of ideal sampling coefficients of the signals according to the secondary phase difference, and determining the sampling coefficient corresponding to the current modulation value according to the differential phase waveform corresponding to the current modulation value;
determining the sampling coefficient of the signal according to the difference value of the ideal sampling coefficient of the signal and the sampling coefficient corresponding to the current modulation value;
and performing interpolation operation on the sampling coefficient of the signal to obtain a differential phase waveform of the signal.
In particular, the sampling coefficient corresponding to the current modulation value can be understood as the sampling coefficient corresponding to the current modulation valueThe sampling coefficient of the signal is determined by interpolation operation, and the sampling coefficient of the differential phase waveform of the signal corresponding to the current modulation value can be obtained by inverse operation or in a sampling coefficient database of the signal corresponding to the current modulation which is calculated. And according to the equation relation between the secondary phase difference and the difference value of the ideal sampling coefficient of the signal, calculating to obtain the difference value of the ideal sampling coefficient of the signal. Wherein, the equation relation of the difference value of the secondary phase difference and the ideal sampling coefficient of the signal can be the equation relation of Adelta=delta, and according to delta= (A) H A) -1 A H Delta results in a difference in the ideal sampling coefficients of the signal. Accumulating the sampling coefficient corresponding to the current modulation value according to the difference delta of the ideal sampling coefficient of the signal to obtain the sampling coefficient of the signal
Performing difference operation on the sampling coefficients of the signals to obtain phase waveforms of the signals
n＝1,2,…,L*S+Δn。
S240, determining the inter-symbol interference coefficient of the signal and the symbol statistic of the signal by utilizing the differential phase waveform of the signal and the phase difference of the signal, and carrying out symbol equalization on the signal according to the inter-symbol interference coefficient and the symbol statistic to obtain the target modulation value of the signal.
Fig. 2A is a schematic diagram of a signal equalization method according to an embodiment of the present invention, where, as shown in fig. 2A, a current modulation value, a phase difference between a signal and a signal are obtained, and the current modulation value is added to a modulation value set corresponding to the current modulation value to obtain a modified modulation value set; and carrying out delay calculation according to the modulation parameters of the signals and the modulation parameters of the signals to obtain the delay time of the first signals. And performing phase difference calculation according to the signals and the delay time to obtain the phase difference of the signals. An ideal phase difference sample of the signal is calculated from the ideal differential phase waveform and the set of modified modulation values, and a secondary phase difference of the signal is calculated from the phase difference of the signal and the ideal phase difference sample, and a difference value of sampling coefficients of the signal is determined from the secondary phase difference. The difference value of the sampling coefficients of the signals and the sampling coefficient of the signals corresponding to the current modulation value are used for obtaining the sampling coefficient of the signals, and the sampling coefficient of the signals is used for carrying out difference value operation to obtain the differential phase waveform of the signals. And determining the inter-symbol interference coefficient of the signal by utilizing the differential phase waveform of the signal, and performing symbol sampling on the signal by utilizing the phase difference of the signal to obtain the symbol statistic of the signal. And carrying out symbol equalization on the signal according to the inter-symbol interference coefficient and the symbol statistic to obtain a target modulation value of the signal.
Further, determining the inter-symbol interference coefficient of the signal and the symbol statistic of the signal using the differential phase waveform of the signal and the phase difference of the signal, includes:
determining an intersymbol interference coefficient of the signal by utilizing a differential phase waveform of the signal;
and performing symbol sampling on the signal by utilizing the phase difference of the signal to obtain symbol statistics of the signal.
Illustratively, differential phase waveforms of signals are utilized
Symbol sampling is performed on the signal to determine the inter-symbol interference coefficient of the signal. Such as: calculating a signal start position and a differential phase waveform of the signal from the signal sign when the sign sample is the peak position sample>
Distance of peak position +.>
Wherein->
Is rounded down. At each of theThe phase difference delta theta at the d-th sampling point after the symbol start position Δn (n) sampling according to symbol period to obtain x (l) =ΔΘ Δn (d+s x l), wherein l is a symbol number; when the symbol samples are matched filter samples, the phase difference delta theta of the signals is used Δn (n) differential phase waveform of sum signal +.>
Convolution of->
The convolution c (n) is sampled at the d=l×s+Δn sampling points after each symbol start position by a symbol period to obtain x (L) =c (d+s×l), where L is the symbol number. Differential phase waveform according to signal- >
Calculating differential phase waveforms of signals
Is>
Differential phase waveform according to signal->
The autocorrelation function ρ (n) of the signal calculates the intersymbol interference coefficient isicoueff=ρ (d: S:2l×s+2Δn), i.e., the differential phase waveform of the signal +.>
The autocorrelation function p (n) of (c) takes a value every S samples at intervals starting from the d sample point until the end of p (n).
Illustratively, the phase difference ΔΘ of the signal is utilized Δn (n) symbol sampling the signal to obtain symbol statistics of the signal. Such as: calculating signal start position and differential phase waveform of signal according to signal sign
Distance of peak position +.>
Wherein->
Is rounded down. Phase difference delta theta for signal at d-th sample point after each symbol start position Δn (n) sampling according to symbol period to obtain x (l) =ΔΘ Δn (d+s x l), wherein l is a symbol number; when the symbol samples are matched filter samples, the phase difference delta theta of the signals is used Δn (n) differential phase waveform of sum signal
Convolution of->
The convolution c (n) is sampled at the d=l×s+Δn sampling points after each symbol start position according to the symbol period to obtain x (L) =c (d+s×l).
According to the embodiment of the invention, the corrected modulation value set is determined by acquiring the current modulation value, the signal and the phase difference of the signal; correcting the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal; and determining the inter-symbol interference coefficient of the signal and the symbol statistic of the signal by using the differential phase waveform of the signal and the phase difference of the signal, and performing symbol equalization on the inter-symbol interference coefficient and the symbol statistic to obtain the target modulation value of the signal. In other words, in the embodiment of the invention, the differential phase waveform of the current modulation value is subjected to waveform correction by utilizing the existing modulation value set to obtain the differential phase waveform of the signal, so that the adaptive correction of the signal waveform can be performed before the signal is equalized, the waveform of the signal is accurately estimated, the signal waveform is subjected to iterative correction by triggering through a new modulation value, and the complexity of signal equalization is reduced under the condition that training data is not used.
Fig. 3 is a schematic structural diagram of a signal equalization device according to an embodiment of the present invention, as shown in fig. 3, where the signal equalization device includes:
a set determining module 310, configured to obtain a current modulation value, a signal, and a phase difference between the signals, and determine a modified modulation value set according to the current modulation value;
the waveform correction module 320 is configured to correct the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set, so as to obtain a differential phase waveform of the signal;
and the symbol equalization module 330 is configured to determine an inter-symbol interference coefficient of the signal and a symbol statistic of the signal by using a differential phase waveform of the signal and a phase difference of the signal, and perform symbol equalization on the signal according to the inter-symbol interference coefficient and the symbol statistic to obtain a target modulation value of the signal.
In one embodiment, the waveform correction module 320 corrects the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal, and includes:
calculating an ideal differential phase waveform of the signal according to an ideal phase response function and a delay time of the signal;
And correcting the differential phase waveform corresponding to the current modulation value according to the ideal differential phase waveform, the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal.
In one embodiment, the waveform correction module 320 corrects the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal, and includes:
calculating an ideal phase difference sample of the signal from the ideal differential phase waveform and the set of modified modulation values;
calculating a secondary phase difference of the signal according to the ideal phase difference sampling and the phase difference of the signal;
and correcting the differential phase waveform corresponding to the current modulation value according to the secondary phase difference to obtain the differential phase waveform of the signal.
In one embodiment, the waveform correction module 320 calculates a secondary phase difference of the signal from the ideal phase difference sample and the phase difference of the signal, including:
determining a column vector of the ideal phase difference sample and a column vector corresponding to a phase difference of the signal;
and taking the difference value of the column vector corresponding to the phase difference of the signal and the column vector sampled by the ideal phase difference as the secondary phase difference of the signal.
In one embodiment, the waveform correction module 320 corrects the differential phase waveform corresponding to the current modulation value according to the secondary phase difference to obtain a differential phase waveform of the signal, including:
determining the difference value of ideal sampling coefficients of the signals according to the secondary phase difference, and determining the sampling coefficient corresponding to the current modulation value according to the differential phase waveform corresponding to the current modulation value;
determining the sampling coefficient of the signal according to the difference value of the ideal sampling coefficient of the signal and the sampling coefficient corresponding to the current modulation value;
and performing interpolation operation on the sampling coefficient of the signal to obtain a differential phase waveform of the signal.
In one embodiment, the set determining module 310 determines a modified modulation value set according to the current modulation value, including:
and adding the current modulation value to a modulation value set corresponding to the current modulation value to obtain the corrected modulation value set.
In one embodiment, the symbol equalization module 330 determines an inter-symbol interference coefficient of the signal and a symbol statistic of the signal using a differential phase waveform of the signal and a phase difference of the signal, including:
Determining an intersymbol interference coefficient of the signal by utilizing a differential phase waveform of the signal;
and performing symbol sampling on the signal by utilizing the phase difference of the signal to obtain symbol statistics of the signal.
The device of the embodiment of the invention determines a corrected modulation value set by acquiring the current modulation value, the signal and the phase difference of the signal; correcting the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal; and determining the inter-symbol interference coefficient of the signal and the symbol statistic of the signal by utilizing the differential phase waveform of the signal and the phase difference of the signal, and carrying out symbol equalization on the signal by using the inter-symbol interference coefficient and the symbol statistic to obtain the target modulation value of the signal. In other words, in the embodiment of the invention, the differential phase waveform of the current modulation value is subjected to waveform correction by utilizing the existing modulation value set to obtain the differential phase waveform of the signal, so that the adaptive correction of the signal waveform can be performed before the signal is equalized, the waveform of the signal is accurately estimated, the signal waveform is subjected to iterative correction by triggering through a new modulation value, and the complexity of signal equalization is reduced under the condition that training data is not used.
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. Fig. 4 illustrates a block diagram of an exemplary electronic device 12 suitable for use in implementing embodiments of the present invention. The electronic device 12 shown in fig. 4 is merely an example and should not be construed as limiting the functionality and scope of use of embodiments of the present invention.
As shown in fig. 4, the electronic device 12 is in the form of a general purpose computing device. Components of the electronic device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, a bus 18 that connects the various system components, including the system memory 28 and the processing units 16.
The system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM) 30 and/or cache memory 32. The electronic device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from or write to non-removable, nonvolatile magnetic media (not shown in FIG. 4, commonly referred to as a "hard disk drive"). Although not shown in fig. 4, a magnetic disk drive for reading from and writing to a removable non-volatile magnetic disk (e.g., a "floppy disk"), and an optical disk drive for reading from or writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In such cases, each drive may be coupled to bus 18 through one or more data medium interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored in, for example, memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment. Program modules 42 generally perform the functions and/or methods of the embodiments described herein.
The electronic device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), one or more devices that enable a user to interact with the electronic device 12, and/or any devices (e.g., network card, modem, etc.) that enable the electronic device 12 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 22. Also, the electronic device 12 may communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN) and/or a public network, such as the Internet, through a network adapter 20. As shown, the network adapter 20 communicates with other modules of the electronic device 12 over the bus 18. It should be appreciated that although not shown in fig. 4, other hardware and/or software modules may be used in connection with electronic device 12, including, but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, for example, implementing a signal equalization method provided by an embodiment of the present invention, the method including:
Acquiring a current modulation value, a signal and a phase difference of the signal, and determining a corrected modulation value set according to the current modulation value;
correcting the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal;
and determining an intersymbol interference coefficient of the signal and a symbol statistic of the signal by utilizing the differential phase waveform of the signal and the phase difference of the signal, and carrying out symbol equalization on the signal according to the intersymbol interference coefficient and the symbol statistic to obtain a target modulation value of the signal.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, the program when executed by a processor implementing a signal equalization method as described, the method comprising:
acquiring a current modulation value, a signal and a phase difference of the signal, and determining a corrected modulation value set according to the current modulation value;
correcting the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal;
And determining an intersymbol interference coefficient of the signal and a symbol statistic of the signal by utilizing the differential phase waveform of the signal and the phase difference of the signal, and carrying out symbol equalization on the signal according to the intersymbol interference coefficient and the symbol statistic to obtain a target modulation value of the signal.
The computer storage media of embodiments of the invention may take the form of any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (6)
1. A method of signal equalization, applied to a receiver, comprising:
acquiring a current modulation value, a signal and a phase difference of the signal, and determining a corrected modulation value set according to the current modulation value;
correcting the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set to obtain the differential phase waveform of the signal, wherein the method comprises the following steps: calculating an ideal differential phase waveform of the signal according to an ideal phase response function and a delay time of the signal; calculating an ideal phase difference sample of the signal from the ideal differential phase waveform and the set of modified modulation values; determining a column vector of the ideal phase difference sample and a column vector corresponding to a phase difference of the signal; taking the difference value of the column vector corresponding to the phase difference of the signal and the column vector sampled by the ideal phase difference as the secondary phase difference of the signal; determining the difference value of ideal sampling coefficients of the signals according to the secondary phase difference, and determining the sampling coefficient corresponding to the current modulation value according to the differential phase waveform corresponding to the current modulation value; determining the sampling coefficient of the signal according to the difference value of the ideal sampling coefficient of the signal and the sampling coefficient corresponding to the current modulation value; performing interpolation operation on the sampling coefficient of the signal to obtain a differential phase waveform of the signal;
And determining an intersymbol interference coefficient of the signal and a symbol statistic of the signal by utilizing the differential phase waveform of the signal and the phase difference of the signal, and carrying out symbol equalization on the signal according to the intersymbol interference coefficient and the symbol statistic to obtain a target modulation value of the signal.
2. The method of claim 1, wherein determining a set of modified modulation values from the current modulation value comprises:
and adding the current modulation value to a modulation value set corresponding to the current modulation value to obtain the corrected modulation value set.
3. The method of claim 1, wherein determining the inter-symbol interference coefficient of the signal and the symbol statistic of the signal using the differential phase waveform of the signal and the phase difference of the signal comprises:
determining an intersymbol interference coefficient of the signal by utilizing a differential phase waveform of the signal;
and performing symbol sampling on the signal by utilizing the phase difference of the signal to obtain symbol statistics of the signal.
4. A signal equalization apparatus, comprising:
the set determining module is used for acquiring a current modulation value, a signal and a phase difference of the signal, and determining a corrected modulation value set according to the current modulation value;
The waveform correction module is configured to correct the differential phase waveform corresponding to the current modulation value according to the phase difference of the signal and the corrected modulation value set, so as to obtain a differential phase waveform of the signal, and includes: calculating an ideal differential phase waveform of the signal according to an ideal phase response function and a delay time of the signal; calculating an ideal phase difference sample of the signal from the ideal differential phase waveform and the set of modified modulation values; determining a column vector of the ideal phase difference sample and a column vector corresponding to a phase difference of the signal; taking the difference value of the column vector corresponding to the phase difference of the signal and the column vector sampled by the ideal phase difference as the secondary phase difference of the signal; determining the difference value of ideal sampling coefficients of the signals according to the secondary phase difference, and determining the sampling coefficient corresponding to the current modulation value according to the differential phase waveform corresponding to the current modulation value; determining the sampling coefficient of the signal according to the difference value of the ideal sampling coefficient of the signal and the sampling coefficient corresponding to the current modulation value; performing interpolation operation on the sampling coefficient of the signal to obtain a differential phase waveform of the signal;
And the symbol equalization module is used for determining an intersymbol interference coefficient of the signal and a symbol statistic of the signal by utilizing the differential phase waveform of the signal and the phase difference of the signal, and carrying out symbol equalization on the signal according to the intersymbol interference coefficient and the symbol statistic to obtain a target modulation value of the signal.
5. An electronic device, the electronic device comprising:
one or more processors;
storage means for storing one or more programs,
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the signal equalization method of any of claims 1-3.
6. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements a signal equalisation method according to any one of the claims 1-3.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101199014A (en) * | 2005-07-20 | 2008-06-11 | 松下电器产业株式会社 | Waveform equalization controller |
| JP2011101149A (en) * | 2009-11-05 | 2011-05-19 | N H K Itec:Kk | Multipath distortion equalization device in ofdm signal reception, and receiver |
| CN102801674A (en) * | 2011-05-26 | 2012-11-28 | 中国电子科技集团公司第五十研究所 | Incoherent detection method and device of continuous phase modulation signals |
| CN104092638A (en) * | 2014-06-26 | 2014-10-08 | 广州海格通信集团股份有限公司 | Method for designing constant envelope PSK modulator-demodulator |
| CN104092527A (en) * | 2014-06-26 | 2014-10-08 | 广州海格通信集团股份有限公司 | GMSK coherent demodulation stream processing synchronization method combined with difference |
| CN104410593A (en) * | 2014-12-04 | 2015-03-11 | 西北工业大学 | Decision feedback model-based digital symbol nonlinear error correction equalization method |
| WO2017178871A1 (en) * | 2016-04-15 | 2017-10-19 | Indian Institute Of Technology Hyderabad | Method and transmitter for generating a waveform with optimized papr |
| CN108833321A (en) * | 2018-06-26 | 2018-11-16 | 中国人民解放军国防科技大学 | Code CPM signal code block synchronization method based on differential phase waveform matching |
| CN111817994A (en) * | 2019-07-25 | 2020-10-23 | 中国人民解放军陆军工程大学 | Modulation identification method and device based on phase difference constellation diagram clustering |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7231004B2 (en) * | 2003-04-18 | 2007-06-12 | Harris Corporation | System and method of low power demodulation of continuous phase modulated waveforms |
| FR2932344B1 (en) * | 2008-06-06 | 2010-06-04 | Thales Sa | METHOD OF PURSUING THE PHASE OF A MODULE SIGNAL BY CONTINUOUS PHASE MODULATION AND SYNCHRONIZATION DEVICE USING THE METHOD. |
| US8605828B2 (en) * | 2012-02-17 | 2013-12-10 | National Instruments Corporation | Blind mechanism for demodulating offset QPSK signals in the presence of carrier phase error |
| FR3025386B1 (en) * | 2014-09-03 | 2018-02-16 | Thales Sa | METHOD FOR GENERATING A FILTER BENCH FOR RECEIVING A MODULATED SIGNAL BY CONTINUOUS PHASE MODULATION AND METHOD FOR RECEIVING SAID SIGNAL |
-
2021
- 2021-12-31 CN CN202111665604.4A patent/CN114363127B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101199014A (en) * | 2005-07-20 | 2008-06-11 | 松下电器产业株式会社 | Waveform equalization controller |
| JP2011101149A (en) * | 2009-11-05 | 2011-05-19 | N H K Itec:Kk | Multipath distortion equalization device in ofdm signal reception, and receiver |
| CN102801674A (en) * | 2011-05-26 | 2012-11-28 | 中国电子科技集团公司第五十研究所 | Incoherent detection method and device of continuous phase modulation signals |
| CN104092638A (en) * | 2014-06-26 | 2014-10-08 | 广州海格通信集团股份有限公司 | Method for designing constant envelope PSK modulator-demodulator |
| CN104092527A (en) * | 2014-06-26 | 2014-10-08 | 广州海格通信集团股份有限公司 | GMSK coherent demodulation stream processing synchronization method combined with difference |
| CN104410593A (en) * | 2014-12-04 | 2015-03-11 | 西北工业大学 | Decision feedback model-based digital symbol nonlinear error correction equalization method |
| WO2017178871A1 (en) * | 2016-04-15 | 2017-10-19 | Indian Institute Of Technology Hyderabad | Method and transmitter for generating a waveform with optimized papr |
| CN108833321A (en) * | 2018-06-26 | 2018-11-16 | 中国人民解放军国防科技大学 | Code CPM signal code block synchronization method based on differential phase waveform matching |
| CN111817994A (en) * | 2019-07-25 | 2020-10-23 | 中国人民解放军陆军工程大学 | Modulation identification method and device based on phase difference constellation diagram clustering |
Non-Patent Citations (3)
| Title |
|---|
| Chunrong Kan ; Xiaohua Dong.Frequency domain equalization for multi-h CPM with a training sequence.2013 IEEE Third International Conference on Information Science and Technology (ICIST).2014,全文. * |
| Lin Zhang College of Communications Engineering, PLA University of Science and Technology, Nanjing, Jiangsu, PRC * |
| 多调制指数CPM频域均衡技术研究;张林;阚春荣;余晟;黄蒙蒙;;无线电通信技术(第04期);全文 * |
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|---|---|
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